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"The firefox JS engine now has a fast interpreter, a quick JIT, and a more optimizing one. This means the baseline performance is better in CPython"

Huh?

From what I understand, there are three stages:

- interpreted

- If run 'enough' times, the code is JIT compiled (fast compilation)

- If run 'enough' times again, it is JIT compiled with the most optimizing compiler (slow compilation)

The question is what the firefox JS interpreter has to do with baseline performance in CPython.